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[recon440]

Explanation is much appreciated! I get it now, two 12db/oct roll-offs vs a single-ended 24db/oct roll-off.

I'm going to have a look at Akabak tomorrow.

Just a couple more questions before I start the build:
-Theoretically, let's say I have equal responses (current ported box vs. 4th order). Will firing it off the rear deck be louder than having the woofers firing from the same plane as the B-pillars (woofers are 10cm away from rear seats with twin slot ports between the seats). That's my main motivation in trying out the 4th order.

-Is there software that can model/predict the spatial response at a particular point in an echoic environment? ie. What I have in mind would to input a simplified geometric model of the vehicle environment (measure the width and height of cabin, length between A,B,C pillars, slope of windshields and depth of dash/rear deck). I'd like to see happens when I convolve the transfer function of this environment with the anechoic response of the Speaker box set from a certain point in space.